How to handle Ghostery blocking your HubSpot forms. This appends a message asking user to add your site to whitelist. Just add it to the footer in any HubSpot COS page.

ghostery_hubspot_message.js

$(window).load(function () {
  if($('.hs_cos_wrapper_type_form input[type="text"]').length === 0) {   
    var lang = $('html').attr('lang'); 
    var msg = 'If you are seeing this message you may have Adblock or Ghostery enabled. Please consider enabling Hubspot forms.';
    
    switch(lang) {
      case 'nl':
      case 'nl-be':
        msg = 'Als je deze booschap ziet heb je waarschijnlijk Adblock of Ghostery. Gelieve Hubspot forms toe te laten.';
        break;
    }
    
    $( ".hs_cos_wrapper_type_form" ).html( "<h6>" + msg + "</h6>" );
  }
});